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Hydrovac to Hydroboost conversion

Unread postby jachord on Thu Feb 16, 2017 10:46 am

I have already begun researching and ordering parts for this conversion.

So far I have ordered the following.
Master cylinder 4031345
Hydroboost 529393 $153.99 with $39 core at Oreilly with lifetime warranty.
Pump to Booster hose EDELMANN 91465
Booster to Steering Hose EDELMANN 91463

Once I get the parts in I will document the installation and include any modifications if necessary on this thread. All other parts should remain unmodified with the exception of the removal of the hydrovacs and related plumbing.
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Re: Hydrovac to Hydroboost conversion

Unread postby badbillybiker on Fri Feb 17, 2017 4:55 am

Great start... Looking forward to your progress, postings and successes,,,
After the time it took, the cost and results,,,I STILL don't trust my 1974 Brakes....
PS: Being positively greedy, maybe a u-tube of the conversion process
or a low cost "how I done it" dvd?
This is a major, IMO, project for 1974 and older Travco's...
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Re: Hydrovac to Hydroboost conversion

Unread postby jachord on Fri Feb 17, 2017 8:21 pm

I don't know about a video. I hate looking for informative videos on the internet. A 30 min video for one minute of relevant data is idiotic. Ill think about it though
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Re: Hydrovac to Hydroboost conversion

Unread postby rjsdotorg on Sun Dec 24, 2017 4:16 pm

Very tempting! Looks like parts would be under $300
Don't these split systems have a proportioning valve as well?
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Re: Hydrovac to Hydroboost conversion

Unread postby rjsdotorg on Fri Jan 05, 2018 11:47 am

Incidentally, since the older M375 has the master facing the opposite of the newer M400 (which is to the rear), is it even possible?
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Re: Hydrovac to Hydroboost conversion

Unread postby gojoe on Mon Feb 26, 2018 11:44 am

The brakes on my Dodge are beat. Drum up front/ hydrovac, etc. I want to get started on this very same conversion. Currently trying to work out a deal with a guy that has the discs and calipers for the front. Just wondering how your attempt of this is working out (parts, etc)?
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Re: Hydrovac to Hydroboost conversion

Unread postby rjsdotorg on Mon Feb 26, 2018 1:05 pm

My current brakes are OK and functioning, so it is on hold.
Disk mounts and spindles for the front are seemingly the most difficult sourcing.
Any brakes from any year for a Dana 70 should fit the rear axle mounts.
The hoses and master set are readily available for many years.
The only odd thing is that the OEM master faces the opposite way from the later hydroboost.
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Re: Hydrovac to Hydroboost conversion

Unread postby gojoe on Mon Feb 26, 2018 2:36 pm

There's gotta be a way to make it work. Probably need to rework the bracket a bit to account for the booster unit. IDK. I just can't see spending the dollars on refreshing my current system only to be left with the inferior of the two.
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Re: Hydrovac to Hydroboost conversion

Unread postby rjsdotorg on Mon Feb 26, 2018 9:51 pm

I don't think there is a big problem with the master; it might even bolt right in. The plunger-shaft might need to be swapped over.
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Re: Hydrovac to Hydroboost conversion

Unread postby gojoe on Tue Jun 05, 2018 8:37 am

Fin ally found some front calipers and associated hardware to get me started on reworking my 73's factory system. I found the parts while traveling in co. Had some tools on board so removed everything while taking time to admire pikes peak just 50 miles to the west. Desert dwellers are a unique bunch. Lots of old vehicles out in those parts. My next move is to call around on some of the parts listed on daves78 site. Some of the parts I don't see there are the power steering pump lines and the metering valve and other things that I'm likely not yet aware of. Anybody have any suggestions on part numbers?
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